<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
      }
      html,
      body {
        width: 100%;
        height: 100%;
      }

      .slider-thumb {
        width: 100%;
        height: 100%;
        position: relative;
        background: linear-gradient(90deg, #23a6d5, #23d5ab);
      }

      .slider-thumb::before {
        display: block;
        position: absolute;
        content: '';
        left: 50%;
        top: 50%;
        width: 600px;
        height: 600px;
        margin-left: -300px;
        margin-top: -300px;
        background: #17141d;
        border-radius: 62% 47% 82% 35% / 45% 45% 80% 66%;
        will-change: border-radius, transform, opacity;
        animation: sliderShape 5s linear infinite;
        display: block;
      }

      @keyframes sliderShape {
        0%,
        100% {
          border-radius: 42% 58% 70% 30% / 45% 45% 55% 55%;
          transform: translate3d(0, 0, 0) rotateZ(0.01deg);
        }
        34% {
          border-radius: 70% 30% 46% 54% / 30% 29% 71% 70%;
          transform: translate3d(0, 5px, 0) rotateZ(0.01deg);
        }
        50% {
          transform: translate3d(0, 0, 0) rotateZ(0.01deg);
        }
        67% {
          border-radius: 100% 60% 60% 100% / 100% 100% 60% 60%;
          transform: translate3d(0, -3px, 0) rotateZ(0.01deg);
        }
      }
    </style>
  </head>
  <body>
    <div class="slider-thumb"></div>
  </body>
</html>
